I have bred leopard geckos for 4 years but currently don't have a male right now!! Sucken eggs can mean infertile also if they were just layed they will be soft and sucken in but make sure the humidity is around 80-100% humidity when incubating and also I would incubate them in a incubator because room temps will take a long time for them to hatch!! If you want male leopard geckos babies then incubate at 88-90 degrees and for females 68-80 degrees. You can candle the eggs at around 3 days and see if they are fertile, they will have a red glow or veins forming and if they are infertile they will be clearish yellow, but always wait to be sure in a week or two if they are fertile and if not throw them out!! Good Luck and let me know also what morphs do you have? Melissa